Luke 1:59
and came on the eighth day to circumcise the child. They were about to call him "Zachariah," after his father,
Luke 2:21
When eight days had passed, and the time had come to circumcise him, he was called Jesus, the name given him by the angel before his conception in the womb.
Philippians 3:5
circumcised the eighth day, of the stock of Israel, of the tribe of Benjamin, a Hebrew sprung from the Hebrews; as to the Law, a Pharisee;
Acts 7:8
"Then he gave him a covenant of circumcision, and under this covenant he became the father of Isaac, whom he circumcised on the eighth day, and Isaac became the father of Jacob, and Jacob became the father of the twelve Patriarchs.